no need to colourize the \u, colourizing \$ is enough
-PS1="`[ -n "$GUIX_ENVIRONMENT" ] && printf \" [env]\"`\n$PS1"
-__u='`[ \`id -u\` == "0" ] && printf "\[\e[1;31m\]\u\[\e[00m\]" || printf "\u"`'
-PS1="$__u@\h:\w/$PS1"
+PS1="\u@\h:\w/`[ -n "$GUIX_ENVIRONMENT" ] && printf \" [env]\"`\n$PS1"
# set terminal title
PROMPT_COMMAND='echo -ne "\033]0;${USER}@${HOSTNAME}: $(b_prompt)\007"'
# set terminal title
PROMPT_COMMAND='echo -ne "\033]0;${USER}@${HOSTNAME}: $(b_prompt)\007"'